From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3F80CC433FF for ; Mon, 29 Jul 2019 20:12:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 09EBB217D6 for ; Mon, 29 Jul 2019 20:12:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564431166; bh=cD9rrDxEyc0yZkzD6bSEDLpUywUmGpNUOh7GXJ8xpX8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=EBAEwppLXsBLdFkERW5RT0pHBp4XGIyab6S1sV9wJoHNq1DV2Dk4iFJ++hec8ugDb 4PNcHUOdd0aJnaaeUm1wqqBTV8wlWuBIQ+UCi2qJ5rEV3pO6Ejj58WQeazj/bPI+Gx acI0yM83To/dcpcfIrYRDH9gnJogMuAG7Y1oq9YY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729236AbfG2TbT (ORCPT ); Mon, 29 Jul 2019 15:31:19 -0400 Received: from mail.kernel.org ([198.145.29.99]:43988 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728715AbfG2TbN (ORCPT ); Mon, 29 Jul 2019 15:31:13 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0D6142171F; Mon, 29 Jul 2019 19:31:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564428672; bh=cD9rrDxEyc0yZkzD6bSEDLpUywUmGpNUOh7GXJ8xpX8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IlVhvXBbm7p/L+VOO2twgcA1FwRa6ZezfV3OSPZZO8ipu9R9CFIpjK6R8Vnolku1w AyPP0EZ+sGZFc/8KO9XyCDpSgpNcHXA0N5+03+ADlBKPgd9lESTVbscYValV+uIPgx 925TM8XqCj4D+CiOmsXmu59sdLw2xZvaBYJ9HIhw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Joe Perches , Like Xu , Paolo Bonzini Subject: [PATCH 4.14 143/293] KVM: x86/vPMU: refine kvm_pmu err msg when event creation failed Date: Mon, 29 Jul 2019 21:20:34 +0200 Message-Id: <20190729190835.494094365@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190729190820.321094988@linuxfoundation.org> References: <20190729190820.321094988@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Like Xu commit 6fc3977ccc5d3c22e851f2dce2d3ce2a0a843842 upstream. If a perf_event creation fails due to any reason of the host perf subsystem, it has no chance to log the corresponding event for guest which may cause abnormal sampling data in guest result. In debug mode, this message helps to understand the state of vPMC and we may not limit the number of occurrences but not in a spamming style. Suggested-by: Joe Perches Signed-off-by: Like Xu Cc: stable@vger.kernel.org Signed-off-by: Paolo Bonzini Signed-off-by: Greg Kroah-Hartman --- arch/x86/kvm/pmu.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/arch/x86/kvm/pmu.c +++ b/arch/x86/kvm/pmu.c @@ -131,8 +131,8 @@ static void pmc_reprogram_counter(struct intr ? kvm_perf_overflow_intr : kvm_perf_overflow, pmc); if (IS_ERR(event)) { - printk_once("kvm_pmu: event creation failed %ld\n", - PTR_ERR(event)); + pr_debug_ratelimited("kvm_pmu: event creation failed %ld for pmc->idx = %d\n", + PTR_ERR(event), pmc->idx); return; }